I saw this on Ebay. It may be what you need if it is the right year.

http://cgi.ebay.com/ebaymotors/ws/eB...m=79 87465424

Brian.....

Don Benton wrote:
> Hopefully my last question on differentials.
>
> I can't seem to locate the '94+ parts, but one outfit quoted me $350
> for a locking differential out of a '93. I recall reading they
> weren't particularly effective, but my question is, are they any
> stronger than the non-lockers for those years?
>
> DonB
> '91 white